32 ounce, double walled, vacuum sealed 304 stainless steel construction. BPA free polymer flip lid with attachment loop, food grade silicone seal, and rubber grip ring. Bone Tactical wide mouth water bottles are built to last a lifetime. The double-walled vacuum technology keeps hot drinks hot and cold drinks ice cold all day long. The included extra paracord survival handle also features a compass, fire starter, knife, and whistle... all built in.